MISTEACH
Source: 566, 567
misteach. Misteach, v.t. mistaught, pret. mistaught, pa. to teach wrong or amiss, to teach badly
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Mis‐teach″ (?), v. t. [imp. & p. p. Mistaught (?); p. pr. & vb. n. Misteaching.] [[AS. mistǣcan.]] To teach wrongly; to instruct erroneously.